Simple FSR (force sensor resistor) example

Simple Arduino example from Adafruit to print outforce sensor resistor values and light an LED depending on pressure.

Components

• • 1 x force resistor 

  • 1 x 10k ohm resistor

  • 1 LED

  • 1 200 ohm resistor

  • 1 x Arduino Uno

  • 1 x breadboard

  • jumper wires

Setup

Arduino sketch

Adapted from Adafruit example.

/* FSR testing sketch. 

Connect one end of FSR to 5V, the other end to Analog 0.

Then connect one end of a 10K resistor from Analog 0 to ground

Connect LED from pin 11 through a resistor to ground 

For more information see www.ladyada.net/learn/sensors/fsr.html */

int fsrAnalogPin = 0; // FSR is connected to analog 0

int LEDpin = 11;      // connect Red LED to pin 11 (PWM pin)

int fsrReading;      // the analog reading from the FSR resistor divider

int LEDbrightness;

void setup(void) {

  Serial.begin(9600);   // We'll send debugging information via the Serial monitor

  pinMode(LEDpin, OUTPUT);

}

void loop(void) {

  fsrReading = analogRead(fsrAnalogPin);

  Serial.print("Analog reading = ");

  Serial.println(fsrReading);

  // we'll need to change the range from the analog reading (0-1023) down to the range

  // used by analogWrite (0-255) with map!

  LEDbrightness = map(fsrReading, 0, 1023, 0, 255);

  // LED gets brighter the harder you press

  analogWrite(LEDpin, LEDbrightness);

  delay(100);

}